Synthesis and electrochemical properties of P2-Na-2/3[Ni1/3Mn2/3]O-2 microspheres as cathode materials for sodium-ion batteries

摘要

P2-Na-2/3[Ni1/3Mn2/3]O(2 )microspheres with well-distributed particle size and high tapping density have been successfully prepared via a hydroxide co-precipitation route associated with the solid-state reaction. The as-prepared P2-Na-2/3[Ni1/3Mn2/3]O-2 sample has a high tapping density of 2.23 g cm(-3) and hexagonal morphology indexed to P6(3)/mmc space group. At the same time, it consists of monodisperse microspheres with a diameter of 5-8 mu m, which are closely assembled by many plate-like primary nanoparticles. As cathode material for sodium-ion batteries (abbreviated as SIBs), it exhibits a high initial capacity of 87.8 mAh g(-1) at 0.1 C in the voltage window of 2.3-4.1 V and demonstrates excellent capacity retention of 97.5% after 100 cycles. Therefore, P2-Na-2/3[Ni1/3Mn2/3]O-2 microspheres will be a hopeful cathode material for the application of sodium-ion batteries. (C) 2020 Elsevier B.V. All rights reserved.